US2424025A - Sewing machine attachment - Google Patents

Description

Jul 15,1947. F. GEGAUF 2,424,025

SEWING MACHINE ATTACHMENT Filed Dec. 7, 1945 K s Sheets- Sheet 1 July 15, 1947.- F. GEGAUF SEWING MACHINE ATTACHMENT Filed Dec.- 7, 1945 3 Sheets-Sheet 2 Eye/7601'; m p/22% 7 Filed Dec. 7, 1943 5 Sheets-Sheet 3' Inventor Patente d July' 15, 1947 SEWING MACHINE ATTACHMENT EritzGegauf, Steckborn, Switzerland; assignor to Fritz-Gegaufs siihne Aktiengcsellschaft, Ste'ckborn, Switzerland;

Application December 7, 1943', Serial No. 513355 In-Switzerland August 17', 1942 2' Gla-ims.

This invention. relates" to sewing machine attachments serving for enlarging the-fabric supporting. area. of? sewing machines inwhich the loop-taker is: arranged in. a freely projecting machine;arm..

For carrying; out certain kinds of sewing operationsainlsewingz machinesof thistypeit isnecessary, for producing perfect work, to enlarg the relatively small. fabric supporting area presented bysaidfreelyprojecting arm.-

Acc'ording tothe present invention for this purpose, an. attachment constituting a table for enlarg-ing thefabric supporting area is arranged, advantageously, superimposed on said arm so as to besustained by the latter after being set in position thereon.

Bythese means the fabric supporting area can be enlarged in a relatively simple manner within the embrace of the freely projecting arm so that at the same time a fabric'supporting surface of a correspondingly great stability is obtained.

said: tablebeing' thus adapted to be placed on the fre'ely projecting arm of the sewing machine may be provided with a" stay, advantageously, a pivotal staywhich is intended to rest on the means supportingthe sewing machine. By these means the table is adapted to carry a relatively great load Without risk of being detrimentally affected; even if the fabric supporting area provided by it is offset relative to the freely projecting arm of thesewing machine to a considerable extent.

Furthermore; clamping means may be arranged by means of which the table that can be set on the freely projecting arm of the sewing machine is fixable in position on said arm. By this means'it'is intended to ensure, with the aid ofsimple. reliably functioning means, longitudinalalignment between the arm of the sewing machine and the table for enlarging the fabric supporting area, .whereas. the correct position of the table on-said arm inregard. to the circumference of thelatter is positively ensured by correspondingly shaping, the cross section of the machine arm and fitting the table to the latter.

Three. embodiments of the invention are illustrated. by, way of. example only, in theaccompanying. drawings in which Fig. 1. shows a first embodiment in a longitudinal elevation. with the table set on the. freely projecting: arm of the sewing machine .Fig..2 -is:a.cross section of the-table;

' Fig.3 shows a. longitudinal. section of saidemm nt:

Fig. 4 is a-topplan View of: Fig. l on a. smaller scale;

Fig; 5 showsalongitudinal elevation of: a-sec- 0nd embodiment of the invention with the table set on the freely projecting arm; of the sewing machine;

Fig. 6 is a sectional plan view of Fig. 5

Fig; 7 is. a cross section of the secon'd'emb'odiment- Figs. Sand 9 show av stay in two different sectional views;

Fig. 10 shows a third embodiment of the invention in a longitudinal elevation with the table-set on the freely projecting arm. of the sewingmachine also in this case;

Fig. ll is a crosssection on the line-XI-Qflin Fig. 10-, and

Fig. 121is a sectional'part view'on'the line-XII'- XII in. Fig. 1.1.

Inthefirstt embodiment. of the invention shown in Figs. 1 tov4; the numeral l designates thefreely projecting arm emerging from the base I of the machine and'carrying at'its outer. endzfa'cea pivotal closure-capi-3; By'pivotally'lowering the 010-- sure cap 3- free access to the loop-taker 4, which isaccommodatedin. the projecting. arm I at: the side of the feed dog 5, is provided. in a. known manner. Theloop-taker 4: has-a spool casing! secured therein against detachment by means-not shown, and may, for example, be enclosed by the closure cap 3'; Theloop-taker isdrivenby a shaft 6. The closure. cap 3 is given a cross sectional form corresponding. tothat of the-projecting arm I and its outer, surface isbulged outwardly relative to the; outer endfaceoftthearm .l:.

Ontozthefreely projectingarm I- is. pushed from the'outer end face thereof atable atwhic'h isprovided with a fiat top plate 9' and on. theunder side of whichiisarranged a. yoke l'llifor'the rcception'v of-the arm I. The'yoke l0 is composed of. two stirrups H which are arranged onebehind the. other. in regard. to: the longitudinal aXis; of the projecting arm I" (Fig.2) at: a certain distance apart, the. stirrups. being adapted to the cross sectionalform. of the arm land interconnected at their lower apex by as bridge piece.l.2.i Thepiece. IZ-is-provided-onthe side thereof face ing; towards the projecting arm I Witha recess forengagement with a spring-loaded.locking ball l3 whichziszarrangediin'a'sleeve 4 01'1 the arnri and serves; when cooperating with-thesaidrecess in the: bridge; piece [2: on .the yoke 1G,. for securing thestabiefi: in; position on: the arm: I in: the axial directiomofthelatten.

' 'IEheatable; 8iis' immovably' fastened in the. Circumferential direction on the projecting arm I by a locking bolt I5 (Fig. 3) seating in a hole I6 in the wall surrounding the hollow interior of the arm I. The table top 9 is provided with an oblong aperture H for interengagement with the projecting arm I so that the plane upper surface of the latter is flush with the upper surface of the table top 9.

Therefore, on the sewing machine a plane supporting surface of an appropriate area for the material to be sewn in the machine is provided. To the longitudinal marginal portions bordering the aperture I! of the table top 9 a resilient lagging I8 consisting, for example, of textile material, is applied and a resilient lagging I9 is also applied to both stirrups ll of the yoke III for the purpose of protecting the surface of the projecting arm I, when the table 8 is slid on or oiT the arm I, and at the same time obtaining snug bearing engagement between the table and the projecting arm I. Due to the table 8 being secured directly to the arm I these two parts practically form together a rigid unit. The dismounting of the table 8 is effected by axially retracting the latter from engagement with the projecting arm I against the resistance opposed thereto by the locking ball I3.

In opposite relation to the throat plate a pivotal lid 22 is arranged in an opening 2| in the table top 9 joining with the aperture I I and being wider than the latter. If the pivotal lid 22 is swung from the position shown in full lines in Fig. 3, in which the lid is flush with the upper surface of the table top 9, into the chain-dotted position of inclination shown in this figure the closure cap 3 of the projecting arm I is accessible from above through the opening 2I then being uncovered, whereby access from above is pro vided for also for the spool casing and the looptaker while the table 8 remains in position on the projecting arm I. The sliding of the table 8 on as well as off the projecting arm I can thus be readily carried out without any further provisions so that it is possible to readily enlarge and re- -duce again the area of the fabric supportingsurface of the sewing machine as desired. If required the table may be adapted to be placed on the projecting arm of the sewing machine also in 7 some other fashion than by slidingly engaging it therewith.

Dependent upon requirements, the table may be sustained .by any other suitable supporting means than the projecting arm, for example, by an attachment carrier plate arranged on the body portion of the machine, or the like.

In the second embodiment of the invention as shown inFigs. 5 to 9 the yoke ID is constituted by a stirrup I0. provided with a reinforcing rib. The edge of the squared off table top 9 removed from the projecting arm I of the sewing machine is provided with a pivotal stay 25 which is pivotally mounted by means of two eye-bearings 26 on two bolts 21 that are arranged on the table top 9 in coaxial relation to each other. The pivotal stay 25 is, if taken as a whole, substantially in the form of a stirrup the arms of which serve as supporting legs 28 into the free ends of each of which a frictionproducing pluglike castor 29, for example of rubber, is sunk. In its position of use as shown in Fig. 5 the pivotal stay 25 rests on a plane support 30 for the, what may be termed, table supported sewing machine and it will be seen that the stays form an obtuse angle with the table top9. With the pivotal stays 25 in this position these bear against the respective edge of the table top 9 by means of the edge 3| (Fig. 9) of their connecting bar by which means the angular range of the stays and thus the angular position of the stays is defined relative to the table top 9 and thus to the support 30 of the sewing machine.

The table top 9 thus supported at its end removed from the projecting arm I of the sewing machine withstands any loading that may arise in actual practice without risk of being detrimentally affected irrespective of the extent to which the fabric supporting area formed by the table top 9 may be offset from the said projecting arm I. The sewing Woman can therefore, for example, rest with her arm on the table 8 without restraint. Obviously the structural form of the pivotal stay may vary within wide limits. Thus, the stay may be composed of several parts that can bepivotally adjusted independently of each other instead of constituting an individual unit. Further the stay need not necessarily be in form of a'pivotal stay.

The operation of slidingly engaging and disengaging the table 8 with or from the projecting arm I respectively can be readily efiected without any further provisions so that it is possible to enlarge the, fabric supporting area of the sewing machine as well as reduce said area again in a quick manner. In the position of non-use of the table 8 the pivotal stay 25 can be swung towards the under side of the table top 9, that is, pivotally moved into contacting engagement with said side in the direction of the arrow shown in Fig. 5.

In the third embodiment of the invention shown in Figs. 10 to 12 a clamping device cooperates with the projecting arm I of the sewing machine below said arm. This device comprises a control lever 35 connected with a spindle 32 which is carried by a bearing 33 arranged in the yoke II]. On the spindle 32 a circular disc 34 is arranged in eccentric relation thereto and is adapted to en-' gage in a recess in the yoke I0. By appropriately pivotally displacing the lever 35 the eccentric disc is can either be pressed against a counter surface presented to it by the projecting arm of the sewing machine or be moved out of engagement with said-surface. If the clamping lever 35 is in the position I the eccentric disc 34 is inefiective, wliereas'withthe clamping lever 35 being in position II said disc is pressed againstthe machine arm I and consequently the table 8 is urged against the machine arm I from above by means of the longitudinal marginal portions of the aperture IT in the table top '9 so that the table 8 is fixed to the machine arm I' and withstands tension exerted thereon in the axial direction. On swinging the clamping lever 35 from the position II back into position I the table 8 can be pulled oil the machine arm I or be pushed thereon as required.

Iclaimr' V 1. In sewing machine attachments for enlarging the fabric-supporting area of sewing machines having the loop-taker means included in an arm freely projecting from said machine, a table having a fabric-supporting top surface, said table having an opening formed therein, a hollow projecting machine arm having a fabricsl pporting top surface for mating said top surface of said table, a, casing having a spoolcarrying the sewing thread accommodated in the hollow of said arm, a pivotal lid associated with said opening in said tabl e for covering the latter and when uncovering if onbeingswung upwardly provlding access to said casing from above, and

mounting means interposed between said table and said projecting arm for sustaining said table on said arm on being [placed on the latter in a position wherein said two fabric-supporting surfaces are mating each other for enlarging the fabric-supporting area of said sewing machine.

2. In sewing machine attachments for enlarging the fabric supporting area of sewing machines having loop-taker means included in an arm freely projecting from said machine, a machine support, a table carrying a table top having a fabric-supporting top surface, a freely projecting machine arm having a fabric-supporting top surface for mating said top surface of said table, means for arranging said table on said projecting arm in a position wherein said two fabric supporting surfaces are mating each other for enlarging the fabric-supporting area of said sewing machine, and a pivotal stay swingably arranged at the end of said table remote from said projecting arm for resting on said machine support when said table is in said position, said stay being swingable into contact with the under side of said table top when said table is not being used.

FRITZ GEGAUF.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

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